Hiroshima Atomic Bomb Museum: Damage to the City

The island in the
center of this photograph contained the Sarugaku-cho neighborhood, which
is where the Hiroshima Peace Park is now located. The large Industrial
Promotion Hall, with its turqoise colored roof is directly across the river
from Sarugaku-cho.

The red marker at
the left and center of this display shows the hypocenter of the blast.
The T-shaped Aioi River bridge is said to be the aiming point for the bomb,
which makes it rather inaccurately dropped. The zero-mile marker
for Hiroshima city is much closer, being just to the right of, and on the
same riverbank as, the bridge nearest the hypocenter. It's
surprising that any structures survived, especially the large building
at the bottom of the diorama.

These photographs were taken from the roof of that large building.

Several photographs
were taken from the ground after the blast, by residents of adjacent valleys
which were shielded from the direct effects of the explosion.

Perhaps it's because
I'm an engineer that the thing which affected me most is this description
of the force of the explosion.